Homework Solution 3
1. question E5 page 56
v0 = -12 m/s g = -10 m/s2 t = 1.0 s v = v0 + g t = -12 m/s + (-10 m/s2 ) (1.0 s) = -22 m/s . Here, " - " means downward. 2. question E10 page 56 a. v0 = 18 m/s g = -3 m/s2 t=4s v = v0 + g t = 18 m/s + (-3 m/s2 )
1. question 21 page 35 a. Velocity is vector quantity. If we set the forward movement to the positive vector, the car moves forward because velocity is everywhere positive on the graph. b. ans: A , The change of velocity is greatest, or slope is deepest.